The Rotor Clip SE-21ST ZD is a radially assembled external E-ring retaining ring designed for 0.219" (5.600 mm) shaft diameters. This retaining ring is crafted from carbon steel and features a zinc dichromate finish, providing enhanced corrosion resistance and durability. The ring's dimensions include a free diameter of 0.185" (4.700 mm), an outside diameter of 0.437" (11.100 mm), and a thickness of 0.025" (0.635 mm). It is engineered to fit into grooves with diameters ranging from 0.188" to 0.190" (4.775 mm to 4.830 mm) and groove depths of 0.015" (0.381 mm). The SE-21ST ZD is suitable for applications requiring a maximum thrust load of 75 lbs (33.8 kg) and can operate at speeds up to 26,000 RPM. This retaining ring is an economical alternative to axially assembled external tapered section rings, offering ease of installation and reliable performance. Its design ensures effective retention of assemblies, making it a valuable component in various mechanical systems.